Sparking plug.



B. 1'. FERGUSON & R. I. FENTON. I

smnmw PLUG. APPLICATION FILED J'ULY 10, 1912 LIWABYD Patented July 14, 19m

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(Z 4 l 4 z Urnirnio smarts mam orraon 1 BENJAMIN T. FERGUSON AND RICHARD F. FENTON, 0F STANDARD, LOUISIANA.

I SPARKING Prue.

Specification of Letters Patent. Pg mm dwm 14 1914;

' Application filed July 10, 1912. Serial No. 708,717.

To all whom it may concern:

Be it known that we, BENJAMIN T. FER-- -marily in internal combustion engine and is of a type wherein a succession of sparks are formed at the, inner end of the plug to make the ignition of the gases {more certain to create explosions.

The primary object of the present inventlon is to provide a spark plug of the character aforesaid, with an electrode extending diagonally through the core of insulation to cooperate with a pluralityof electrodes or bridges mounted in the lower end of the core of insulation which will give a series of sparks without splitting the current, thereby carrying the full current across each point to the ground.

With the above and otherobjects in view,

this invention consists of the novel details of construction, formation and arrangement of parts as will be hereinafter more fully de cribed and the advantages will be hereinafter referred to and particularly pointed out in the appended laim.

In the drawings, Figure 1' is a vertical section taken through the casing of our improved sparking plug showing the core of insulation in elevation. Fig. 2 is'a similar section taken at right angles thereto, and Fig. 3 is a bottom plan view of the same.

Reference now being had more particularly to the drawings wherein we have illustrated corresponding parts by like numerals throughout the several views, this improved plug consists of a casing 1 of any preferred pattern of construction and has formed at its inner end with threads 2 which are adapted to engagewith threads formed in the opening within the cylinder for receiving the plug in the usual and well known manner. This casing i provided with a central bore in which is mounted the "core of insulation made of porcelain, 'mica, or any other suitable insulation material indicated by the numeral 3. This core of insulation 1s provided with an annular flange which is adapted to rest against a shoulder 4.- formed within the casing. To provide means for holding the core of insulation within the bore formed in the casing, we provide a nut 5, having threads mounted on the periphery thereof adapted to engage the threaded portion of the bore, in the usual and well known manner.

The conductor, indicated by the numeral 6 extends diagonally through the core of insulation from the enter of the upper end to one side of the center at its lower end and then terminating in a hooked tip or bridge 7. Also mounted within the lower eX- tremity of this core is a plurality of hooked wires or bridges 8 which are held in spaced relation as shown. The said bridges having their hooked ends extending in opposite directions, but terminating in a line extending lineally across the center of the lower face of the core; An electrode 9 is mounted within the lowerextremity of the casing having a hooked end which is in alinement with the ends of the beforementioned electrodes. I

From the foregoing description, it is apparent that a full current will be carried across each of the hooked ends of these bridges or electrodes without splitting the current thereby arranging a serie in a circuit to form a succession of jump-sparks. The arrangement of these hooked ends will obviously make four jump-sparks in such close succession within the cylinder that it creates a sheet of flame extending substantially entirely across the lower end face of the core which makes ignition more positive in that it ignites a greater volume of gas.

bodiment of the present invention, it is of course, to be understood that there may be as many of these bridges as desired, thereby increasing or diminishing the number of sparks and it is to be further understood that other minor details of construction may be resorted to that come within the scope of the present invention without departing from the spirit thereof.

Having thus described our invention, what we claim is I A spark plug comprising a casing, a core of insulation therein, a ground electrode ing its terminal disposed at one side of the core and contiguous thereto, a plurality of electrodes mounted in staggered relation in the lower end of the core and projecting Wherein we have shown a specific emfixed to the lower end of the casing and hav- I Q i 1,103,187.

from the bottom face thereof, said electrodes In testimony Whereofwe hereunto afik 10 being equally spaced from each other and our signatures in the presence of two Wit-' having oppositely disposed hooked ends ter nesses. l

minatlng upon a line extending diametri- T cally across the bottom-face ofthe core and g in elinement with the terminal of the ground electrode, whereby a line of spark extend- Witnesses:

ing substantially entirely across the bottom T W.

face of theoore is produced. JJB. WISE. 

